package org.ray.veader;

import android.app.Activity;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.GestureDetector.SimpleOnGestureListener;

public class SimpleGestureFilter extends SimpleOnGestureListener{

    

	 static interface SimpleGestureListener{

	 void onDoubleTap();

	 void onSwipe(int direction);

 }

	 public final static int SWIPE_UP    = 1;

	 public final static int SWIPE_DOWN  = 2;

	 public final static int SWIPE_LEFT  = 3;

	 

	 public final static int SWIPE_RIGHT = 4;

	 public final static int MODE_TRANSPARENT = 0;

	 public final static int MODE_SOLID       = 1;

	 

	 public final static int MODE_DYNAMIC     = 2;

	 private final static int ACTION_FAKE = -13; //just an unlikely number

	 private int swipe_Min_Distance = 100;

	 private int swipe_Max_Distance = 350;

	 

	 private int swipe_Min_Velocity = 100;

	 private int mode      = MODE_DYNAMIC;

	 private boolean running = true;

	 

	 private boolean tapIndicator = false;

	 private Activity context;

	 private GestureDetector detector;

	 

	 

	 private SimpleGestureListener listener;

	 

	 public SimpleGestureFilter(Activity context,SimpleGestureListener sgl) {

	 

	  this.context = context;

	  this.detector = new GestureDetector(context, this);

	  this.listener = sgl; 

	 }

	 

	 public int getMode(){

	  return this.mode;

	 }

	 

	 public int getSwipeMaxDistance(){

	  return this.swipe_Max_Distance;

	 }

	 

	 public int getSwipeMinDistance(){

	  return this.swipe_Min_Distance;

	 }

	 

	 public int getSwipeMinVelocity(){

	  return this.swipe_Min_Velocity;

	 }

	 

	 @Override

	 public boolean onDoubleTap(MotionEvent arg0) {

	  this.listener.onDoubleTap();;

	  return true;

	 }

	 

	 @Override

	 public boolean onDoubleTapEvent(MotionEvent arg0) {

	  return true;

	 }

	 

	 @Override

	 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,

	   float velocityY) {



	  final float xDistance = Math.abs(e1.getX() - e2.getX());

	  final float yDistance = Math.abs(e1.getY() - e2.getY());



	  if(xDistance > this.swipe_Max_Distance || yDistance > this.swipe_Max_Distance)

	   return false;



	  velocityX = Math.abs(velocityX);

	  velocityY = Math.abs(velocityY);

	        boolean result = false;



	  if(velocityX > this.swipe_Min_Velocity && xDistance > this.swipe_Min_Distance){

	   if(e1.getX() > e2.getX()) // right to left

	    this.listener.onSwipe(SWIPE_LEFT);

	   else

	    this.listener.onSwipe(SWIPE_RIGHT);

	   

	   result = true;

	  }

	  else if(velocityY > this.swipe_Min_Velocity && yDistance > this.swipe_Min_Distance){

	   if(e1.getY() > e2.getY()) // bottom to up 

	    this.listener.onSwipe(SWIPE_UP);

	   else

	    this.listener.onSwipe(SWIPE_DOWN);

	   

	   result = true;

	  }



	   return result;

	 }

	 

	 @Override

	 public boolean onSingleTapConfirmed(MotionEvent arg0) {

	  

	  if(this.mode == MODE_DYNAMIC){        // we owe an ACTION_UP, so we fake an       

	     arg0.setAction(ACTION_FAKE);      //action which will be converted to an ACTION_UP later.                                    

	     this.context.dispatchTouchEvent(arg0);  

	  }   

	     

	  return false;

	 }

	 

	 @Override

	 public boolean onSingleTapUp(MotionEvent e) {

	  this.tapIndicator = true;

	  return false;

	 }

	 

	 

	 public void onTouchEvent(MotionEvent event){

	  

	   if(!this.running)

	  return;  

	  

	   boolean result = this.detector.onTouchEvent(event); 

	  

	   if(this.mode == MODE_SOLID)

	    event.setAction(MotionEvent.ACTION_CANCEL);

	   else if (this.mode == MODE_DYNAMIC) {

	  

	     if(event.getAction() == ACTION_FAKE) 

	       event.setAction(MotionEvent.ACTION_UP);

	     else if (result)

	       event.setAction(MotionEvent.ACTION_CANCEL); 

	     else if(this.tapIndicator){

	      event.setAction(MotionEvent.ACTION_DOWN);

	      this.tapIndicator = false;

	     }

	  

	   }

	   //else just do nothing, it's Transparent

	 }



	 public void setEnabled(boolean status){

	  this.running = status;

	 }



	 public void setMode(int m){

	  this.mode = m;

	 }



	 public void setSwipeMaxDistance(int distance){

	  this.swipe_Max_Distance = distance;

	 }



	 public void setSwipeMinDistance(int distance){

	  this.swipe_Min_Distance = distance;

	 }

	 

	 

	    public void setSwipeMinVelocity(int distance){

		  this.swipe_Min_Velocity = distance;

		 }

	 

	}
